Lexmark X950 - Toner Fog or Background Shading Appears on the Page; Toner Rubs off

Toner fog or background shading appears on the page
Try one or more of the following:
MAKE SURE THE TONER CARTRIDGE IS INSTALLED CORRECTLY OR IS NOT DEFECTIVE
Reinstall or replace the defective toner cartridge.
MAKE SURE THE TRANSFER MODULE IS NOT WORN OR DEFECTIVE
Replace the worn or defective transfer module.
MAKE SURE THE PHOTOCONDUCTOR UNIT IS NOT WORN OR DEFECTIVE
Replace the word or defective photoconductor unit.
MAKE SURE THE FUSER IS NOT WORN OR DEFECTIVE
Replace the worn or defective fuser.
MAKE SURE THE PRINTER HAS RECALIBRATED RECENTLY
Perform color adjust from the Quality menu.
MAKE SURE THE APPLICATION HAS NOT SPECIFIED AN OFF‑WHITE BACKGROUND
Check the application settings.
MAKE SURE NO TONER IS IN THE PAPER PATH
Contact customer support.
Toner rubs off
Try one or more of the following:
Troubleshooting 341